| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Joost VandeVondele
Date: Wed Jan 29 07:25:18 2020 +0100 Timestamp: 1580279118 Fix compilation on android Fall back to the default implementation of aligned_ttmem_alloc, which was introduced as part of 39437f4e55aaa26ef9f0d5a1c762e560e9ffde32 Fixes #2524 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: joergoster
Date: Tue Jan 28 19:25:39 2020 +0100 Timestamp: 1580235939 Simplify hashfull calculation. We can simplify the calculation of the hashfull info by looping over exact 1,000 entries, and then divide the result by ClusterSize. Somewhat memory accesses, somewhat more accurate. Passed non-regression LTC https://tests.stockfishchess.org/tests/view/5e30079dab2d69d58394fd5d LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 30125 W: 3987 L: 3926 D: 22212 Elo +0.70 Ptnml(0-2): 177, 2504, 9558, 2642, 141 closes https://github.com/official-stockfish/Stockfish/pull/2523 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Guenther Demetz
Date: Tue Jan 28 16:28:56 2020 +0100 Timestamp: 1580225336 More bonus for bestMoves on past PV nodes It looks like it is important to keep past PV (ttPv) nodes as close as possible to current PV nodes. Credits to Mark Tenzer (31m059) & Stefan Geschwentner who first tried ideas on ttPv nodes. STC: https://tests.stockfishchess.org/tests/view/5e2ff5efab2d69d58394fd52 LLR: 2.95 (-2.94,2.94) {-1.00,3.00} Total: 13302 W: 2647 L: 2507 D: 8148 Elo +3.66 Ptnml(0-2): 237, 1540, 2956, 1632, 260 LTC: https://tests.stockfishchess.org/tests/view/5e2fff38ab2d69d58394fd55 LLR: 2.95 (-2.94,2.94) {0.00,2.00} Total: 15797 W: 2137 L: 1960 D: 11700 Elo +3.89 Ptnml(0-2): 96, 1443, 4628, 1547, 130 closes https://github.com/official-stockfish/Stockfish/pull/2529 bench: 5545845 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: 31m059
Date: Tue Jan 28 10:31:25 2020 +0100 Timestamp: 1580203885 Less NMP if the position was previously in PV. The intention of the patch is to avoid aggressive null move pruning (NMP) in positions that have previously been found to be important (PV nodes). If we already do not apply NMP for current PV nodes, it makes sense to apply it less often for positions that have previously been PV nodes too. STC: LLR: 2.96 (-2.94,2.94) {-1.00,3.00} Total: 14959 W: 2921 L: 2782 D: 9256 Elo +3.23 Ptnml(0-2): 254, 1679, 3493, 1762, 282 http://tests.stockfishchess.org/tests/view/5e2f6637ab2d69d58394fcfd LTC: LLR: 2.95 (-2.94,2.94) {0.00,2.00} Total: 6442 W: 899 L: 753 D: 4790 Elo +7.88 Ptnml(0-2): 42, 549, 1885, 659, 61 http://tests.stockfishchess.org/tests/view/5e2f767bab2d69d58394fd04 closes https://github.com/official-stockfish/Stockfish/pull/2525 Bench: 4725546 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Alain SAVARD
Date: Mon Jan 27 18:14:10 2020 +0100 Timestamp: 1580145250 Dynamic Complexity based on psqt Adjust initiative score by psqt/2 instead of materialScore/2 which simplifies #2516 Passed STC http://tests.stockfishchess.org/tests/view/5e2e667dab2d69d58394fc73 LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 23198 W: 4506 L: 4353 D: 14339 Elo +2.29 Ptnml(0-2): 396, 2615, 5380, 2728, 418 Passed LTC http://tests.stockfishchess.org/tests/view/5e2ed75cab2d69d58394fcbf LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 8519 W: 1179 L: 1062 D: 6278 Elo +4.77 Ptnml(0-2): 50, 775, 2472, 843, 74 closes https://github.com/official-stockfish/Stockfish/pull/2522 Bench: 4684459 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Sami Kiminki
Date: Mon Jan 27 11:16:10 2020 +0100 Timestamp: 1580120170 Advise the kernel to use huge pages (Linux) Align the TT allocation by 2M to make it huge page friendly and advise the kernel to use huge pages. Benchmarks on my i7-8700K (6C/12T) box: (3 runs per bench per config) vanilla (nps) hugepages (nps) avg ================================================================================== bench | 3012490 3024364 3036331 3071052 3067544 3071052 +1.5% bench 16 12 20 | 19237932 19050166 19085315 19266346 19207025 19548758 +1.1% bench 16384 12 20 | 18182313 18371581 18336838 19381275 19738012 19620225 +7.0% On my box, huge pages have a significant perf impact when using a big hash size. They also speed up TT initialization big time: vanilla (s) huge pages (s) speed-up ======================================================================= time stockfish bench 16384 1 1 | 5.37 1.48 3.6x In practice, huge pages with auto-defrag may always be enabled in the system, in which case this patch has no effect. This depends on the values in /sys/kernel/mm/transparent_hugepage/enabled and /sys/kernel/mm/transparent_hugepage/defrag. closes https://github.com/official-stockfish/Stockfish/pull/2463 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Alain SAVARD
Date: Mon Jan 27 09:05:55 2020 +0100 Timestamp: 1580112355 Dynamic complexity Instead of computing the initiative bonus on the material score + dynamic score compute it on (material score/2) + dynamic score, Passed STC http://tests.stockfishchess.org/tests/view/5e2c4945ab2d69d58394fa8f LLR: 2.94 (-2.94,2.94) {-1.00,3.00} Total: 39387 W: 7594 L: 7386 D: 24407 Elo +1.83 Ptnml(0-2): 658, 4519, 9165, 4649, 697 Passed LTC http://tests.stockfishchess.org/tests/view/5e2c85ccab2d69d58394faa7 LLR: 2.95 (-2.94,2.94) {0.00,2.00} Total: 32588 W: 4206 L: 3986 D: 24396 Elo +2.35 Ptnml(0-2): 244, 2909, 9738, 3111, 253 closes https://github.com/official-stockfish/Stockfish/pull/2516 Bench: 4765486 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Lolligerhans
Date: Sat Jan 25 09:44:09 2020 +0100 Timestamp: 1579941849 Tweak RestrictedPiece bonus Double the "RestrictedPiece" bonus for restricted moves targeting occupied squares. STC LLR: 3.58 (-2.94,2.94) {-1.00,3.00} Total: 25504 W: 4887 L: 4697 D: 15920 Elo +2.59 Ptnml(0-2): 387, 2935, 5947, 3051, 422 https://tests.stockfishchess.org/tests/view/5e2aa15dab2d69d58394f94d LTC LLR: 2.94 (-2.94,2.94) {0.00,2.00} Total: 28572 W: 3826 L: 3621 D: 21125 Elo +2.49 Ptnml(0-2): 224, 2609, 8403, 2791, 239 https://tests.stockfishchess.org/tests/view/5e2ae7f4ab2d69d58394f9a6 Bench: 4719086 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Stefan Geschwentner
Date: Thu Jan 23 19:12:48 2020 +0100 Timestamp: 1579803168 History update for pruned captures Use a SEE pruned capture move for history updates: this patch collects pruned capture moves also in the failed captures list, so that they get an update in capture history. STC: LLR: 2.95 (-2.94,2.94) {-1.00,3.00} Total: 11124 W: 2222 L: 2089 D: 6813 Elo +4.15 Ptnml(0-2): 186, 1280, 2506, 1381, 200 http://tests.stockfishchess.org/tests/view/5e28995fc3b97aa0d75bc294 LTC: LLR: 2.94 (-2.94,2.94) {0.00,2.00} Total: 25552 W: 3418 L: 3211 D: 18923 Elo +2.81 Ptnml(0-2): 168, 2354, 7538, 2490, 200 http://tests.stockfishchess.org/tests/view/5e2943734744cfa4d6af415b Closes https://github.com/official-stockfish/Stockfish/pull/2511 Bench: 4810202 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Thu Jan 23 19:03:25 2020 +0100 Timestamp: 1579802605 Tweak trapped rook penalty This patch greatly increases the endgame penalty for having a trapped rook. Idea was a result of witnessing Stockfish losing some games at CCCC exchanging pieces in the position with a trapped rook which directly lead to a lost endgame. This patch should partially fix such behavior making this penalty high even in deep endgames. Passed STC http://tests.stockfishchess.org/tests/view/5e279d7cc3b97aa0d75bc1c4 LLR: 2.94 (-2.94,2.94) {-1.00,3.00} Total: 8528 W: 1706 L: 1588 D: 5234 Elo +4.81 Ptnml(0-2): 133, 957, 1985, 1024, 159 Passed LTC http://tests.stockfishchess.org/tests/view/5e27aee4c3b97aa0d75bc1e1 LLR: 2.95 (-2.94,2.94) {0.00,2.00} Total: 88713 W: 11520 L: 11130 D: 66063 Elo +1.53 Ptnml(0-2): 646, 8170, 26342, 8492, 676 Closes https://github.com/official-stockfish/Stockfish/pull/2510 Bench: 4964462 ---------------------- Comment by Malcolm Campbell: Congrats! I think this might be a common pattern - scores that seem to mainly apply to the midgame are often better with a similar (or at least fairly big) endgame value as well. Maybe there are others eval parameters we can tweak like this... see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Stefan Geschwentner
Date: Thu Jan 23 18:53:50 2020 +0100 Timestamp: 1579802030 Less reduction for escape moves at ttPv nodes At expected PV nodes or nodes which marked as PV node in the hash table, reduce escape moves even one ply less. STC: LLR: 2.94 (-2.94,2.94) {-1.00,3.00} Total: 31795 W: 6140 L: 5953 D: 19702 Elo +2.04 Ptnml(0-2): 525, 3625, 7455, 3695, 583 http://tests.stockfishchess.org/tests/view/5e25d77fc3b97aa0d75bc013 LTC: LLR: 2.94 (-2.94,2.94) {0.00,2.00} Total: 43975 W: 5708 L: 5454 D: 32813 Elo +2.01 Ptnml(0-2): 314, 4012, 13070, 4242, 325 http://tests.stockfishchess.org/tests/view/5e2618c1c3b97aa0d75bc03c Closes https://github.com/official-stockfish/Stockfish/pull/2505 Bench: 4475583 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Guenther Demetz
Date: Thu Jan 23 18:43:47 2020 +0100 Timestamp: 1579801427 Use (strict) greater-than-operator for 'improving' Currently on a normal bench run in ~0,7% of cases 'improving' is set to true although the static eval isn't improving at all, just keeping equal. It looks like the strict gt-operator is more appropriate here, since it returns to 'improving' its literal meaning without sideffects. STC {-1.00,3.00} failed yellow: https://tests.stockfishchess.org/tests/view/5e1ec38c8fd5f550e4ae1c28 LLR: -2.93 (-2.94,2.94) {-1.00,3.00} Total: 53155 W: 10170 L: 10109 D: 32876 Elo +0.40 Ptnml(0-2): 863, 6282, 12251, 6283, 892 non-regression LTC passed: https://tests.stockfishchess.org/tests/view/5e1f1c0d8fd5f550e4ae1c41 LLR: 2.98 (-2.94,2.94) {-1.50,0.50} Total: 23961 W: 3114 L: 3018 D: 17829 Elo +1.39 Ptnml(0-2): 163, 2220, 7114, 2298, 170 CLoses https://github.com/official-stockfish/Stockfish/pull/2496 bench: 4561386 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Chess13234
Date: Thu Jan 23 18:33:01 2020 +0100 Timestamp: 1579800781 Minor fixes for misc.cpp Fixes conflict with tune.h STRINGIFY macro. No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Thu Jan 23 18:20:11 2020 +0100 Timestamp: 1579800011 Use a std::bitset for KPKBitbase This is a non-functional simplification. Looks like std::bitset works good for the KPKBitbase. Thanks for Jorg Oster for helping get the speed up (the [] accessor is faster than test()). Speed testing: 10k calls to probe: master 9.8 sec patch 9.8 sec. STC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 100154 W: 19025 L: 18992 D: 62137 Elo +0.11 Ptnml(0-2): 1397, 11376, 24572, 11254, 1473 http://tests.stockfishchess.org/tests/view/5e21e601346e35ac603b7d2b Closes https://github.com/official-stockfish/Stockfish/pull/2502 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Thu Jan 23 17:59:03 2020 +0100 Timestamp: 1579798743 Determine opposite colors mathematically This is a non-functional speed-up: master has to access SquareBB twice while this patch determines opposite_colors just using the values of the squares. It doesn't seem to change the overall speed of bench, but calling opposite_colors(...) 10 Million times: master: 39.4 seconds patch: 11.4 seconds. The only data point I have (other than my own tests), is a quite old failed STC test: LLR: -2.93 (-2.94,2.94) [-1.50,4.50] Total: 24308 W: 5331 L: 5330 D: 13647 Elo +0.01 Ptnml(0-2): 315, 2577, 6326, 2623, 289 http://tests.stockfishchess.org/tests/view/5e010256c13ac2425c4a9a67 Closes https://github.com/official-stockfish/Stockfish/pull/2498 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Thu Jan 23 17:49:10 2020 +0100 Timestamp: 1579798150 Simplify KPK classify This is a non-functional simplification. If we use the "side to move" of the entry instead of the template, one of the classify methods goes away. Furthermore, I've resolved the colors in some of the statements (we're already assuming direction using NORTH), and used stm (side to move) instead of "us," since this is much clearer to me. This is not tested because it is non-functional, only applies building the bitbase and there are no changes to the binary (on my machine). Closes https://github.com/official-stockfish/Stockfish/pull/2485 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Thu Jan 23 17:31:45 2020 +0100 Timestamp: 1579797105 Simplify signature of remove_piece() This is a non-functional simplification. Instead of passing the piece type for remove_piece, we can rely on the board. The only exception is en-passant which must be explicitly set because the destination square for the capture is not the same as the piece to remove. Verified also in the Chess960 castling case by running a couple of perft, see the pull request discussion: https://github.com/official-stockfish/Stockfish/pull/2460 STC LLR: 2.94 (-2.94,2.94) [-3.00,1.00] Total: 18624 W: 4147 L: 4070 D: 10407 Elo +1.44 Ptnml(0-2): 223, 1933, 4945, 1938, 260 http://tests.stockfishchess.org/tests/view/5dfeaa93e70446e17e451163 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Stéphane Nicolet
Date: Thu Jan 23 17:17:26 2020 +0100 Timestamp: 1579796246 Restore development version No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Stéphane Nicolet
Date: Sat Jan 18 01:44:37 2020 +0100 Timestamp: 1579308277 Stockfish 11 Official release version of Stockfish 11. Bench: 5156767 ----------------------- It is our pleasure to release Stockfish 11 to our fans and supporters. Downloads are freely available at http://stockfishchess.org/download/ This version 11 of Stockfish is 50 Elo stronger than the last version, and 150 Elo stronger than the version which famously lost a match to AlphaZero two years ago. This makes Stockfish the strongest chess engine running on your smartphone or normal desktop PC, and we estimate that on a modern four cores CPU, Stockfish 11 could give 1:1000 time odds to the human chess champion having classical time control, and be on par with him. More specific data, including nice cumulative curves for the progression of Stockfish strength over the last seven years, can be found on [our progression page][1], at [Stefan Pohl site][2] or at [NextChessMove][3]. In October 2019 Stockfish has regained its crown in the TCEC competition, beating in the superfinal of season 16 an evolution of the neural-network engine Leela that had won the previous season. This clash of style between an alpha-beta and an neural-network engine produced spectacular chess as always, with Stockfish [emerging victorious this time][0]. Compared to Stockfish 10, we have made hundreds of improvements to the [codebase][4], from the evaluation function (improvements in king attacks, middlegame/endgame transitions, and many more) to the search algorithm (some innovative coordination methods for the searching threads, better pruning of unsound tactical lines, etc), and fixed a couple of bugs en passant. Our testing framework [Fishtest][5] has also seen its share of improvements to continue propelling Stockfish forward. Along with a lot of small enhancements, Fishtest has switched to new SPRT bounds to increase the chance of catching Elo gainers, along with a new testing book and the use of pentanomial statistics to be more resource-efficient. Overall the Stockfish project is an example of open-source at its best, as its buzzing community of programmers sharing ideas and daily reviewing their colleagues' patches proves to be an ideal form to develop innovative ideas for chess programming, while the mathematical accuracy of the testing framework allows us an unparalleled level of quality control for each patch we put in the engine. If you wish, you too can help our ongoing efforts to keep improving it, just [get involved][6] :-) Stockfish is also special in that every chess fan, even if not a programmer, [can easily help][7] the team to improve the engine by connecting their PC to Fishtest and let it play some games in the background to test new patches. Individual contributions vary from 1 to 32 cores, but this year Bojun Guo made it a little bit special by plugging a whole data center during the whole year: it was a vertiginous experience to see Fishtest spikes with 17466 cores connected playing [25600 games/minute][8]. Thanks Guo! The Stockfish team [0]: <http://mytcecexperience.blogspot.com/2019/10/season-16-superfinal-games-91-100.html> [1]: <https://github.com/glinscott/fishtest/wiki/Regression-Tests> [2]: <https://www.sp-cc.de/index.htm> [3]: <https://nextchessmove.com/dev-builds> [4]: <https://github.com/official-stockfish/Stockfish> [5]: <https://tests.stockfishchess.org/tests> [6]: <https://stockfishchess.org/get-involved/> [7]: <https://github.com/glinscott/fishtest/wiki> [8]: <https://groups.google.com/forum/?fromgroups=#!topic/fishcooking/lebEmG5vgng%5B1-25%5D> see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Stéphane Nicolet
Date: Wed Jan 15 22:25:05 2020 +0100 Timestamp: 1579123505 Update Readme.md for the compiler command No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Joost VandeVondele
Date: Wed Jan 15 11:40:44 2020 +0100 Timestamp: 1579084844 Tweak late move reductions at root More LMR at root, unless a fail low might happen. passed STC: LLR: 2.94 (-2.94,2.94) {-1.00,3.00} Total: 25428 W: 4960 L: 4789 D: 15679 Elo +2.34 Ptnml(0-2): 424, 2948, 5832, 3045, 460 http://tests.stockfishchess.org/tests/view/5e1c9afed12216a2857e6401 passed LTC: LLR: 2.94 (-2.94,2.94) {0.00,2.00} Total: 187423 W: 24253 L: 23599 D: 139571 Elo +1.21 Ptnml(0-2): 1284, 17437, 55536, 18085, 1292 http://tests.stockfishchess.org/tests/view/5e1ceb9975be933c8fe635a3 Closes https://github.com/official-stockfish/Stockfish/pull/2493 Bench: 5156767 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Stefan Geschwentner
Date: Mon Jan 13 12:09:23 2020 +0100 Timestamp: 1578913763 Tweak reductions for captures/promotions From the third move reduce captures and promotions more if remaining depth is low. STC: LLR: 2.94 (-2.94,2.94) {-1.00,3.00} Total: 25218 W: 5008 L: 4837 D: 15373 Elo +2.36 Ptnml(0-2): 439, 2950, 5717, 3001, 499 http://tests.stockfishchess.org/tests/view/5e1b33abd12216a2857e6359 LTC: LLR: 2.95 (-2.94,2.94) {0.00,2.00} Total: 35491 W: 4760 L: 4524 D: 26207 Elo +2.31 Ptnml(0-2): 264, 3288, 10413, 3460, 294 http://tests.stockfishchess.org/tests/view/5e1b88d5d12216a2857e6385 Closes https://github.com/official-stockfish/Stockfish/pull/2488 Bench: 4979757 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Mon Jan 13 11:49:27 2020 +0100 Timestamp: 1578912567 Tweak futility pruning constants Based on recent improvement of futility pruning by @locutus2 : we lower the futility margin to apply it for more nodes but as a compensation we also lower the history threshold to apply it to less nodes. Further work in tweaking constants can always be done - numbers are guessed "by hand" and are not results of some tuning, maybe there is some more Elo to squeeze from this part of code. Passed STC LLR: 2.98 (-2.94,2.94) {-1.00,3.00} Total: 15300 W: 3081 L: 2936 D: 9283 Elo +3.29 Ptnml(0-2): 260, 1816, 3382, 1900, 290 http://tests.stockfishchess.org/tests/view/5e18da3b27dab692fcf9a158 Passed LTC LLR: 2.94 (-2.94,2.94) {0.00,2.00} Total: 108670 W: 14509 L: 14070 D: 80091 Elo +1.40 Ptnml(0-2): 813, 10259, 31736, 10665, 831 http://tests.stockfishchess.org/tests/view/5e18fc9627dab692fcf9a180 Bench: 4643972 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: xoto10
Date: Mon Jan 13 10:47:14 2020 +0100 Timestamp: 1578908834 Fix previous patch in case of ponder No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: xoto10
Date: Sun Jan 12 22:37:24 2020 +0100 Timestamp: 1578865044 Smarter time management near stop limit This patch makes Stockfish search same depth again if > 60% of optimum time is already used, instead of trying the next iteration. The idea is that the next iteration will generally take about the same amount of time as has already been used in total. When we are likely to begin the last iteration, as judged by total time taken so far > 0.6 * optimum time, searching the last depth again instead of increasing the depth still helps the other threads in lazy SMP and prepares better move ordering for the next moves. STC : LLR: 2.95 (-2.94,2.94) {-1.00,3.00} Total: 13436 W: 2695 L: 2558 D: 8183 Elo +3.54 Ptnml(0-2): 222, 1538, 3087, 1611, 253 https://tests.stockfishchess.org/tests/view/5e1618a761fe5f83a67dd964 LTC : LLR: 2.94 (-2.94,2.94) {0.00,2.00} Total: 32160 W: 4261 L: 4047 D: 23852 Elo +2.31 Ptnml(0-2): 211, 2988, 9448, 3135, 247 https://tests.stockfishchess.org/tests/view/5e162ca061fe5f83a67dd96d The code was revised as suggested by @vondele for multithreading: STC (8 threads): LLR: 2.95 (-2.94,2.94) {0.00,2.00} Total: 16640 W: 2049 L: 1885 D: 12706 Elo +3.42 Ptnml(0-2): 119, 1369, 5158, 1557, 108 https://tests.stockfishchess.org/tests/view/5e19826a2cc590e03c3c2f52 LTC (8 threads): LLR: 2.95 (-2.94,2.94) {-1.00,3.00} Total: 16536 W: 2758 L: 2629 D: 11149 Elo +2.71 Ptnml(0-2): 182, 1758, 4296, 1802, 224 https://tests.stockfishchess.org/tests/view/5e18b91a27dab692fcf9a140 Thanks to those discussing Stockfish lazy SMP on fishcooking which made me try this, and to @vondele for suggestions and doing related tests. See full discussion in the pull request thread: https://github.com/official-stockfish/Stockfish/pull/2482 Bench: 4586187 see source |